Line data    Source code

       1             : /* Fetch live process registers from TID.
       2             :    This file is part of elfutils.
       3             : 
       4             :    This file is free software; you can redistribute it and/or modify
       5             :    it under the terms of either
       6             : 
       7             :      * the GNU Lesser General Public License as published by the Free
       8             :        Software Foundation; either version 3 of the License, or (at
       9             :        your option) any later version
      10             : 
      11             :    or
      12             : 
      13             :      * the GNU General Public License as published by the Free
      14             :        Software Foundation; either version 2 of the License, or (at
      15             :        your option) any later version
      16             : 
      17             :    or both in parallel, as here.
      18             : 
      19             :    elfutils is distributed in the hope that it will be useful, but
      20             :    WITHOUT ANY WARRANTY; without even the implied warranty of
      21             :    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      22             :    General Public License for more details.
      23             : 
      24             :    You should have received copies of the GNU General Public License and
      25             :    the GNU Lesser General Public License along with this program.  If
      26             :    not, see <http://www.gnu.org/licenses/>.  */
      27             : 
      28             : #ifdef HAVE_CONFIG_H
      29             : # include <config.h>
      30             : #endif
      31             : 
      32             : #include "system.h"
      33             : #include <assert.h>
      34             : #if defined __riscv && defined __linux__
      35             : # include <sys/uio.h>
      36             : # include <sys/procfs.h>
      37             : # include <sys/ptrace.h>
      38             : #endif
      39             : 
      40             : #define BACKEND riscv_
      41             : #include "libebl_CPU.h"
      42             : 
      43             : bool
      44           0 : riscv_set_initial_registers_tid (pid_t tid __attribute__ ((unused)),
      45             :                                  ebl_tid_registers_t *setfunc __attribute__ ((unused)),
      46             :                                  void *arg __attribute__ ((unused)))
      47             : {
      48             : #if !defined __riscv || !defined __linux__
      49           0 :   return false;
      50             : #else /* __riscv */
      51             : 
      52             :   /* General registers.  */
      53             :   elf_gregset_t gregs;
      54             :   struct iovec iovec;
      55             :   iovec.iov_base = &gregs;
      56             :   iovec.iov_len = sizeof (gregs);
      57             :   if (ptrace (PTRACE_GETREGSET, tid, NT_PRSTATUS, &iovec) != 0)
      58             :     return false;
      59             : 
      60             :   /* X0 is constant 0.  */
      61             :   Dwarf_Word zero = 0;
      62             :   if (! setfunc (0, 1, &zero, arg))
      63             :     return false;
      64             : 
      65             :   /* X1..X31.  */
      66             :   if (! setfunc (1, 32, (Dwarf_Word *) &gregs[1], arg))
      67             :     return false;
      68             : 
      69             :   /* PC.  */
      70             :   if (! setfunc (-1, 1, (Dwarf_Word *) &gregs[0], arg))
      71             :     return false;
      72             : 
      73             :   /* FP registers not yet supported.  */
      74             : 
      75             :   return true;
      76             : #endif /* __riscv */
      77             : }